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Just checking => If you have loosened all of the other head bolts and you are now trying to tackle the last one then you have not been doing this the correct way - there is an order for the release and fitting of the head bolts. You might find that with the other bolts fitted the bolt with the broken fastener top will be easier to remove.
If you have indeed removed all but one of the bolts then you need to get the head checked for flatness before you refit - it could be warped - evenly applied force is required when fitting and when removing.
If you are still struggling with one buggered fastener top some people have reported that sacrificing a tool and welding it in the head of the bolt is a solution - cover up that aluminium alloy head really well though (and remove camshaft and rockers etc)
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